Device for sharpening tailor&#39;s crayons.



B. DENNIS.

DEVICE FOR SHARPENING TAILORS CRAYONS.

APPLICATION FILED JAN. 25. I916.

1,202,975. Patented 0%.31, 1916.

EE NA DI'QNNIE URNEyS UNITED STATES? PATENT @FFICE.

BERNARD DENNIS, OF MALDEN, MASSACHUSETTS, ASSIGNOR 0F ONE-HALF T0 SAMUEL OLANSKY, OF BOSTON, MASSACHUSETTS.

DEVICE FOR SHARPENING TAILOBS CRAYONS.

Specification of Letters Patent.

Patented Oct. 31, 1916.

Application fi1er1 January 25, 1916. Serial No. 74,117.

To all whom it may concern Be it known that I, BERNARD DENNIS, a subject of the Czarof Russia, residing at Malden, in the county of Middlesex and State of Massachusetts, have inventednew and useful Improvements in Devices for Sharpening Tailors Crayons, of which the following is a specification.

The object of the present invention is to provide a device for sharpening tailors crayons. Crayons used by tailors for marking cloth must be provided with sharp edges substantially like the edge of a chisel.

My present invention provides two holders, one of which holds the crayon and the other of which holds a plurality of knives arranged to shave the crayon. The knives are arranged in two series, and those of each series are arranged in stepped relation so that each knife will remove a comparatively thin chip or shaving. The aggregate stock removed by all the knives is such that a single stroke of the movable element will be suflicient to sharpen the edge of thecrayon, and the fact that the knives are arranged so that no one of them will remove a chip or shaving of excessive thickness avoids breaking off the corners of the crayon as the knives leave the latter.

Of the accompanying drawings, which illustrate one form in which the invention may be embodied: Figure 1 represents a side elevation, a portionof the operating rod or handle being broken out. Fig-2 represents a vertical section through the device as shown by Fig. 1. Fig. 3 represents a'horizontal section through the device, showing the knife holder in plan view. Fig. 1 repre-. sents an end elevation of the right-hand end of the device. Fig. 5 represents a vertical. cross section through the structure intersected by line 5-5 of Fig. 2. Fig. 6 represents a vertical cross section, on a larger scale, through the knife holder as indicated by line 66 of Fig. 2. Fig. 7 represents a side elevation of a tailors crayon whose lower edge has been partly sharpened by the device. Fig. 8 represents an inverted plan view of the lower edge of the crayon partly sharpened as shown by Fig. 7, showing the successive degrees of sharpening as performed by the successive knives.

The same reference characters'indicate the same parts wherever they occur.

The holder 10 for the'crayon 11. is a cylin cated.

dric casing, in the present instance, and is provided with a slot 12 in its upper side into which the lower edge of the crayon is inserted for sharpening. The holder 10 is provided with base members 13 adapted to rest upon a fiat horizontal support and capable of receiving screws (not shown) for fastening it to such support. The ends of the holder 10 are closed by plates 14, 15, but the lower portion of the plate 1% is cut away to admit a substantially semi-cylindric receptacle 35 for the chips or shavings.

The knife holder comprises a rod 16 having a handle 17 here shown in the form of a knob. I One of the holders is movable relatively to the other to afford sharpening movement, and'in the present instance the knife holder 16 is the movable element. It is movable longitudinally, and its movement is guided by a tube 18 affixed at its ends to the plates 14 and 15. Two strips, 19 and 20, of thin sheet steel are aihxed to and carried by the rod 16, and the rod is slotted for their reception, as shown by Figs. 5 and 6. The lower portions of the said strips are arranged in the rod and are affixed to the latter by fasteners such as screws 21. The guide tube 18 has a slot 18 at its upper side to afford traverse of the plates 19 and 20 as the rod 16 is recipro- In the present instance the knives are formed on the strips 19 and 20, and for this purpose the latter are cut away to form openings 00, m 12 and m (Fig. 2). Such openings provide the strip 19 with edges a, a a and a, and provide the strip 20 with similar edges indicated respectively at b, Z2 wand 6 which edges are sharpened to cut or shave the crayon. As shown by Fig. 6, the edges of each series are arranged in stepped relation, each edge, excepting the foremost, being arranged to cut deeper than the one ahead of it. In consequence of this arrangement the edges a and Z) will act first and will remove a relatively thin chip or shaving, while the edges a and b will cut slightly deeper and remove another thin chip or shaving, and so on, the edges a and b converging to a jmeeting point, as clearly shown by Fig. 6, to trim the crayon to a sharp edge.

As shown by Fig. 3, the plates 19 and 20 converge from the cutting edges a, 6

toward the :righthand end of the device.

This converging relation sets the successive cutting edges in the desired stepped relation. The fact that the cutting edges are formed on the plates 19 and 20 keeps them in the desired relation to each other, even when they are undergoing a sharpening operation. They may be readily sharpened by means of a thin fiat stone, the openings m, m", 00 and r affording access to the edges for the purpose of sharpening them. This form of structure avoids the necessity of readjusting the edges after each sharpening operation.

The effect of the several cutting edges on the crayon is illustrated by Figs. 7 and. 8, the cuts made by edges a, Z) being indicated. at c, (5, those made by edges a2, 6 being indicated at 0 (Z those made b ed es a 6 being indicated at 0 (Z and the sharp edge made by edges a 6 being indicated at e.

The thickness of. stock removed by each. knife edge is so thin thatthe likelihood of breaking off the corner of the crayon as-the knife edge leaves the latter is avoided. Such breaking of the crayon has been an objectionable result of sharpening devices hitherto made, for the reason that they have out too deeply and have required so much cutting stress as: to result in breakage. strips 19 and 20 are extended in advance of the foremost-*edgesa", l2 and the upper porti0ns.21, 22 of such advance portions are arranged to form a trough (Fig. 5) to receive the crayon. The portions 21 and 22 meet at 23.to form the bottom of the trough, and the meeting point of edgespcfi and b (Fig. 6)v is in alinement with thebottom of such trough. The crayon is-thus prevented from beinginserted so deeply as to enable the foremost cutting edges a, b to break OK the corner of the crayon as they leave the latter.

Referring to Figs. 1, 2 and 3, the knife holder is retracted to the right as far as it will go, the right-hand ends of the strips 19 and 20 abutting againstthe right-hand end of the casing. Vhen the knife holder is in this position the trough-forming portions 21 and 22 are in register with the crayonreceiving opening 12 of'the casing 10, and the device is ready to receive a crayon. Assuming now that a crayon is inserted into the opening 12 and it is desired to sharpen the crayon, a single stroke of; the knife holder from right-to left is sufficient to perform the sharpening operation. As the knife holder moves to the left, the cutting edges a, b" are the first to engage the crayon. An abutment 24 is affixed to the interior of the tube 10 in positionto engage the left-hand vertical edge of the crayon, and to sustain the cutting stress. The-abutment 24 is slightly narrower than the trough formed by the portions 21 and 22, so that said portionsmay pass the abutmenton opposite; sides .of the latter. As the knife holderadvances edges e3. 6, remove; a thin The chip or shaving and form the cuts 0, (Z indicated in Fig. 8. In due course the cutting edges a 2 reach the crayon and remove other thin chips or shavings and form the cuts indicated at 0 (F- The other cutting edges reach the crayon successively, and each one in turn removes a thin chip or shaving. The range of movement of the knife holder is suthcientto, carry the rear cutting edges a 6 beyond the left-hand edge of the crayon,

so that the lower edge of the crayon is reduced. to. a sharp, edge, asindicated at 6 (Fig 8), throughout its length with one stroke of the knife holder; but notwiths I of the tubelO to dispose of theaccumulation of chipsor shavings,

The knife holder may, bewithdrawn from the right-hand end ofthe tube 10, and entirely detached, so that the cutting edges may be sharpenedfrom time to time. For the purpose of-permitting such detachment, theright-hand end plate 15 isprovided with an opening 25. A gate 26 is providedjfor preventing unintentional withdrawal of the knife holder. This gateis in theform of a curved bar and is arranged against the inner face of the end plate-15. A knob-27 having a screw-shank 28 extends through a curved slot 29 in the end plate 15 and-has screwthreaded engagement with the gate 26. By screwing the knob tightly against the plate 15 the gate 26v maybe clamped in operative position, as shown byFigs. 2, 3, 4 and 5. In order to remove thegate from, the path of the knife holder it is only necessary tonnscrew sufiiciently to relieve the clamping pressure and to slidethe knobto the lower end of the slot 29."

I claim: 7 p

1; A device for sharpening tailors crayon, comprising a knife holder and a crayon holder, one of which is movable relatively to the other to afford crayon-sharpening movement, means for guiding the movable holder relatively to. the other, a pairof blades affixed. to said knife holder. and arranged to form a Vsshaped troughto receive anedgeof the crayon, each of said blades having-a seriesof openingsand each such opening having a, sharp edgearranged to shave the crayon, said edges being arrangedin stepped relation so that each one behind the first will remove the stock immedby the zone aheadmfi it.

2. A device for sharpening tailors crayon, comprising a casing, a tube therein, said tube having a slot extending longitudinally thereof, a rod arranged in said tube and adapted to slide lengthwise thereof, and a pair of blades aflixed to said rod in confronting relation to each other and arranged to traverse said slot of said tube, said blades forming a V-shaped trough for the crayon each of said blades having an 10 opening and a sharpening edge thereat for shaving the crayon, said casing having a crayon-receiving opening arranged to register with said trough.

In testimony whereof I have affixed my 15 signature.

BERNARD DENNIS.

Uupies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

